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Finding the Fourth Proportional to 612.77, 845.37 and 391.64

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Solution

The fourth proportional to 612.77, 845.37 and 391.64 is: 540.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.77 : 845.37 = 391.64 : x
  2. Step 2: Convert to fraction form
    612.77/845.37 = 391.64/x
  3. Step 3: Cross multiply
    612.77x = 845.37 × 391.64
  4. Step 4: Simplify right side
    612.77x = 331,076.48
  5. Step 5: Solve for x
    x = 331,076.48/612.77
  6. Step 6: Final answer
    x = 540.30

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Find fourth proportional to 306.38, 422.69 and 195.82
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.